It would kind of make sense for people who just don't want to show their face even if they don't want to be particularly vtuber-y
I was wondering if this would be more common as the technology developed but it seems like it hasn't and instead there are specific ideas about what vtubers are supposed to be that have become entrenched.
There are some people like Hikalium who are using vtuber avatars for live programming videos but not particularly doing a character though